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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Interest $ 28,359 $ 26,639 $ 28,930
Federal income tax 79,702 75,000 100,000
Operating cash flows from operating leases 7,409 8,148 7,935
Operating cash flows from financing leases 66 46 35
Financing cash flows from financing leases 2,666 2,438 1,768
Conversion of alternative investments to equity securities [1] 50,253 0 0
Assets acquired under finance lease arrangements 1,584 707 6,709
Assets acquired under operating lease arrangements 5,885 16,649 3,272
Non-cash purchase of property and equipment 242 70 472
Available-for-sale Securities [Member]      
Corporate actions related to securities 22,741 38,106 56,365
Equity Securities [Member]      
Corporate actions related to securities [2] 0 0 30,666
Conversion of AFS fixed income securities to equity securities $ 0 $ 1,463 $ 15,139
[1] This non-cash exchange represents our investment in a private fund that was initially classified as an alternative investment accounted for using the equity method. The fund was later reclassified as an equity security when the fund transitioned to an Investment Company Act of 1940 fund
[2] Examples of corporate actions include like-kind exchanges, non-cash acquisitions, and stock-splits.